WARNING:
For devs and experts ONLY!
This is not fully functional and it is not well tested yet!
I do not take responsibility for any damage you cause your player!

This is an unofficial port of CM9 alpha to the Galaxy Player 4.0 (USA).

Preparation

MAKE A FULL BACKUP! Make sure you can recover using heimdall or odin.
Backup /system using "dd" use with odin/heimdall, just in case:
dd if=/dev/block/stl9 of=/mnt/sdcard/system.img bs=512
Backup your apps if you care about them

Installation

Download the ROM for your device
Boot into recovery and install the ROM
Do a full wipe. Wipe data, cache, dalvik, everything
Reboot, and you should have cm9!

Issues?

Post any other issue here and I will respond when I get a chance.
Please do NOT send me PM's.